Mocax was Kakamu's personal assistant on Nynrah. He was once an Av-Matoran living in Karda Nui but he was captured and mutated by Makuta Mutran. Mutran mutated Mocax but forgot to drain his natural light energy. Mocax escaped and fled to the swamp but was captured by Kakamu. Mocax fought in the Battle of Zev's HQ but was severely injured. He was healed and helped Kakamu in many of his experiments. When Kakamu sent him to Zakaz in order to retrieve a Nektann power core, Rabot got in his way, so, in a display of impressive strength, Mocax kicked him back.

When Blackout took the contents of Destral onto Darkmount, Mocax probably was transported onto Darkmount too. His current status and whereabouts following Darkmount's destruction is unknown.